It is a software upgrade, which normally takes several hrs to upload. Mine took at least 2 days because halfway, the system crashed and they had to do a hard reset, which meant removing the battery from the car.
After the software upgrade was complete, I noticed several changes in my iDrive while going through various functions.
- ability to turn off the display of the cellphone signal/radio box in the upper right corner
- different layout by having more options when in a call (i think it looks better)
- ability to create conference calls when in a call
Other menu functions are slightly different
Performance wise? - I don't feel any significant changes
2007 AW BMW E92 335 M Sport (Retired)
2009 AW BMW LCI E90 335 xdrive M Sport
2010 Silver BMW LCI E90 328 xdrive (Retired)
2013 Sapphire Black BMW X3 2.8i